escalate dpkg-shlibdeps warning to error

[wjwwood]

As reported by @vrabaud:

http://jenkins.ros.org/job/ros-hydro-cv-bridge_binarydeb_precise_amd64/35/console

I believe it's due to the latest changes in rosconsole:
https://github.com/ros/ros_comm/commit/54f10daf3fb341a947dfde5c1f9e0f1d7e18a63f#diff-b5fbfb775a9e4ac0290db47aa6e2d062

Idea to improve that: can we have some warnings in the jobs to be errors ? We could have avoided the current problem if we had seen in:
http://jenkins.ros.org/job/ros-hydro-rosconsole_binarydeb_precise_amd64/20/console
dpkg-shlibdeps: warning: couldn't find library librosconsole_backend_interface.so needed by debian/ros-hydro-rosconsole/opt/ros/hydro/lib/librosconsole_log4cxx.so (ELF format: 'elf64-x86-64'; RPATH: '').
dpkg-shlibdeps: warning: couldn't find library librosconsole_backend_interface.so needed by debian/ros-hydro-rosconsole/opt/ros/hydro/lib/librosconsole.so (ELF format: 'elf64-x86-64'; RPATH: '').

We will have to figure out how to get dpkg-shlibdeps to make that a fatal error.

[wjwwood]

Moving to the untargeted milestone, because I do not have time to do it for the 0.5 release.